Circuit-closer for fire-alarm systems.



D. PAMP.

CIRCUIT CLOSER FOR FIRE ALARM SYSTEMS.

APPLICATION HLED MAR. I0, 1916.

Patented July 3, 1917.

514/0014 0'6 flame Pam 5,

UNITED PATENT OFFICE.

DANNE PAM-P, O F CHESTER, PENNSYLVANIA.

CIRCUIT-CLOSER FOR FIRE-ALARM ESYSTEMS.

Application filed March 10, 1916.

T all whom it may concern:

Be it known that 1, DANNE PAMP, a citizen of the United States, residing at Chester, in the county of Delaware and State of Pennsylvania, have invented new and useful Improvements in Circuit-Closers for Fire-Alarm Systems, of which the following is a specification.

This invent-ion relates to an automatic fire alarm system by means of which a signal will be given upon the temperature of the medium surrounding the system rising above a predetermined degree.

The primary object of the invention is to provide an apparatus in which the parts are so arranged as to be very sensitive to the in crease of temperature above a pre-determined degree.

An object of the invention is the arrangement of the elements so thatheat may be readily conveyed to the fusible element.

Another object of the invention is to arrange two contacts forming the terminals of an alarm circuit in such a manner that one may gravitate to a position to engage the other upon the fusing of a fusible element.

A further object of the invention is the novel manner of supporting the fusible element so that the same may be subjected to the heated air currents and also to heat con ducted by the solids.

IVith these and other objects in view, the invention consists in the construction, combination and arrangement of parts as will be hereinafter more fully described. illustrated in the accompanying drawing and pointed out in the claims hereunto appended.

In the drawing Figure 1 is a diagrammatic view showing the invention arranged in position.

Fig. 2 is an enlarged vertical sectional view through my invention.

Fig. 3 is a vertical section view on the line 33 of Fig. 2.

Fig. 1 is a bottom-plan view.

Referring to the drawing the numeral 1 designates a casing open at one end and hav ing that portion adjacent the open end perforated as indicated at 2 for the purpose of allowing air current to pass up through the open end and through the perforations. Mounted for sliding movement within the casing 1 and spaced therefrom by means of insulating blocks 3 is a movable contact member of rectangular configuration havan extension 5 encireling but normally Specification of Letters Patent.

Patented July 3, 1917.

Serial No. 83,393.

spaced from the stationary contact member 6 supported by the casing. The contacts 1 and 6 form the terminals for an alarm circuit 7 that includes the source of current 8 and an audible signal such as an electric bell 9. From this arrangement it will be seen that upon the contact member 4 gravitating, the circuit will be closed through the contact 6 and extension 5.

For holding the contact a out of engagement with the contact 6 under normal conditions. I provide a fusible element 10. This fusible element 10 abuts the under surface of the contact 1 and rests upon a plate of insulation 11 that is in turn supported by a contact strip 12. This contact strip 12 is of a less width than the open end of the casing and further has its extremities bent at right angles so as to contact with the sides of the casing as indicated at 12, bolts 13 being provided for detachably connecting the strip to the casing.

At this point, I wish to call attention to the fact that the contact 1 which bears upon the fusible element 10 is normally confined in the closed end of the casing with the result that the same may readily conduct the heat of the confined air in the upper end of the casing to the element 10. The element 10 is so disposed as to be subjected to the heated air currents that pass from the open end of the casing through the perforations and thus it will be seen that the element 10 will receive a maximum amount of heat upon a slight rising temperature of the surrounding medium.

A. very important feature of my invention is the novel manner of supporting the element 10 upon the strip 12 so that when the element 10 fuses, the liquid material may fall from the casing and a new element readily supplied by removing the bolts 18.

From the foregoing description taken in connection with the accompanying drawing it should be apparent that I provide a de vice which is admirably adapted for the purpose for which it is intended. that the device is simple. durable and efficient of construction, and that the device may be manu factured and sold at a comparatively low cost.

Vhat I claim is 1. A circuit closer for alarm circuits in cluding a casing, a strip bidging the lower end of and removably scared to the casing. a fixed eclitact eats rid: across the casing:

a movable contact having an eye to encircle the fixed contact, and fusible means arranged upon the strip and Wholly Within the casing for supporting the movable contact in position to space the eye from the fixed contact.

2. A circuit closer for alarm circuits including a casing, a fixed contact extending across the casing, a movable contact having an eye to encircle the fixed contact, and fusible means arranged Wholly Within the casing for supporting the movable contact in position to space the eye from the fixed contact, and a strip removably connected to the casing for supporting a fusible element, said strip bridging but not completely closing the lower end of the casing.

DANNE PAMP.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

